NDK中的未定义参考错误

Question

I am trying to compile unrar for Android but getting some undefined reference error . I am stuck here for couple of days but can't find the exact problem. I tried to write Android.mk from existing makefile .

Error

jni/unrar/rar.cpp:104: error: undefined reference to 'CommandData::ParseCommandLine(bool, int, char**)'
jni/unrar/rar.cpp:107: error: undefined reference to 'CommandData::ReadConfig()'
jni/unrar/rar.cpp:108: error: undefined reference to 'CommandData::ParseEnvVar()'
jni/unrar/rar.cpp:110: error: undefined reference to 'CommandData::ParseCommandLine(bool, int, char**)'

Android.mk

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
UNRAR_PATH := $(LOCAL_PATH)/unrar
LOCAL_MODULE    := unrar-jni

LOCAL_SRC_FILES := com_unrar_jni.cpp unrar/rar.cpp unrar/strlist.cpp unrar/strfn.cpp unrar/pathfn.cpp unrar/smallfn.cpp unrar/global.cpp unrar/file.cpp unrar/filefn.cpp unrar/filcreat.cpp \
    unrar/archive.cpp unrar/arcread.cpp unrar/unicode.cpp unrar/system.cpp unrar/isnt.cpp unrar/crypt.cpp unrar/crc.cpp unrar/rawread.cpp unrar/encname.cpp \
    unrar/resource.cpp unrar/match.cpp unrar/timefn.cpp unrar/rdwrfn.cpp unrar/consio.cpp unrar/options.cpp unrar/errhnd.cpp unrar/rarvm.cpp unrar/secpassword.cpp \
    unrar/rijndael.cpp unrar/getbits.cpp unrar/sha1.cpp unrar/sha256.cpp unrar/blake2s.cpp unrar/hash.cpp unrar/extinfo.cpp unrar/extract.cpp unrar/volume.cpp \
    unrar/list.cpp unrar/find.cpp unrar/unpack.cpp unrar/headers.cpp unrar/threadpool.cpp unrar/rs16.cpp unrar/cmddata.cpp unrar/ui.cpp \
    unrar/filestr.cpp unrar/recvol.cpp unrar/rs.cpp unrar/scantree.cpp unrar/qopen.cpp 

LOCAL_CFLAGS := -O2
LOCAL_CPPFLAGS := -fexceptions -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE
LOCAL_LDLIBS := -llog
include $(BUILD_SHARED_LIBRARY)

CommandData declares in cmddata.hpp and implemented in cmddata.cpp file. rar.hpp also includes cmddata.hpp But why it's complaining that functions are undefined.

Answer 1

The source code you found is not complete, and does not carry official claims to compile, especially under Android. But the following steps can get you started:

1. open new directory, open command line to that directory.
2. mkdir jni
3. put the Android.mk exactly as you have in your question to jni directory
4. untar unrarsrc-5.3.6.tar.gz to jni/unrar
5. add one line #88 in jni/unrar/rar.hpp : #undef _ANDROID
6. create empty file jni/com_unrar_jni.cpp
7. run ndk-build APP_CFLAGS="-Dgetpass\\(a\\)=a" APP_STL=stlport_static c++_static may work, too )